Patent US3084631A successfully refreshed from Google Patents.
US3084631A
Expired / Lapsed
US
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Helical gear pump with stator compression
Assignee: Robbins and Myers Inc
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Filing: 1962-01-17
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Granted: 1963-04-09
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Expires: 1982-01-17
Abstract
No abstract record available.
Inventors
- 👤 Bourke John David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073; F04C2/1075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A HELICAL GEAR PUMP HAVING A RIGID CASING, AN EXTERNALLY THREADED RIGID ROTOR, AND AN INTERNALLY AND EXTERNALLY THREADED RESILIENT STATOR OF SUBSTANTIALLY CONSTANT WALL THICKNESS AND HAVING ONE THREAD MORE THAN SAID ROTOR, SAID ROTOR AND STATOR BEING DISPOSED WITHIN SAID CASING AND COACTING TO FORM PUMPING POCKETS WHICH PROGRESS AXIALLY THROUGH SAID PUMP, A PLURALITY OF CASING LINER ELEMENTS LINING THE MAJOR PORTION OF THE INTERIOR OF SAID CASING WITH A CIRCUMFERENTIAL CLEARANCE BETWEEN SAID CASING LINER ELEMENTS, SAID LINER ELEMENTS TOGETHER HAVING AN INTERNALLY HELICALLY THREADED CONFIGURATION COMPLEMENTING THE EXTERNALLY THREADED CONFIGURATION OF SAID STATOR, AND MEANS FOR URGING AT LEAST ONE OF SAID LINER ELEMENTS RADIALLY INWARD TO COMPRESS SAID STATOR AGAINST SAID ROTOR.
Claim 2
Dependent Claim
118 words
A HELICAL GEAR PUMP HAVING A RIGID CASING, AN EXTERNALLY THREADED RIGID ROTOR, AND AN INTERNALLY AND EXTERNALLY THREADED RESILIENT STATOR OF SUBSTANTIALLY CONSTANT WALL THICKNESS AND HAVING ONE THREAD MORE THAN SAID ROTOR, SAID ROTOR AND STATOR BEING DISPOSED WITHIN SAID CASING AND COACTING TO FORM PUMPING POCKETS WHICH PROGRESS AXIALLY THROUGH SAID PUMP, A PLURALITY OF CASING LINER ELEMENTS LINING THE MAJOR PORTION OF THE INTERIOR OF SAID CASING WITH A CIRCUMFERENTIAL CLEARANCE BETWEEN SAID CASING LINER ELEMENTS, SAID LINER ELEMENTS TOGETHER HAVING AN INTERNALLY HELICALLY THREADED CONFIGURATION COMPLEMENTING THE EXTERNALLY THREADED CONFIGURATION OF SAID STATOR, AND MEANS FOR URGING AT LEAST ONE OF SAID LINER ELEMENTS RADIALLY INWARD TO COMPRESS SAID STATOR AGAINST SAID ROTOR.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |